https://www.bloomberg.com/news/articles/2022-09-01/drug-recalls-for-nitrosamines-could-cost-big-pharma-millions

https://www.fda.gov/drugs/drug-safety-and-availability/fda-works-avoid-shortage-sitagliptin-following-detection-nitrosamine-impurity

https://www.biospace.com/article/merck-s-blockbuster-diabetes-drug-found-contaminated-with-potential-carcinogen/

https://www.bloomberg.com/news/articles/2022-08-09/drug-used-in-popular-diabetes-therapy-found-to-contain-potential-carcinogen

https://www.webmd.com/diabetes/news/20220810/some-diabetes-drugs-potential-cancer-causing-substance-fda

https://hbw.pharmaintelligence.informa.com/RS152847/Ranitidine-Litigation-Opens-With-Settlements-But-Still-Massive-With-State-And-MDL-Trials-Pending

https://www.verywellhealth.com/medication-reference-chart-for-type-2-diabetes-1087284